Abstract: The traces of two paleo-seismological events,preserved in late Pleistocene sediments at a depth of 2m,were excaved by trenching technique at several sites along the surface fissure zone which was formed during 1976 Tangshan strong earthquake.The geological observation around the suberb of Tangshan city also found some similar evidences.By comparing and analysing surface fissure,seismic faults and liquification scale,seismic intensity for that event was estimated to more or less equal that for Tangshan quake.Based on the 14C dating and computation of sedimentory rate,two events may be estimated to have occurred 7665?105 years and 14865 years ago,respectively,suggesting a recurrence interval of about 7500 years for strong earthquakes in the study region.